AcWing 841. 字符串哈希
原题链接
简单
#include <stdio.h>
typedef unsigned long long ULL;
#define N 100010
#define P 131
int n, m;
char str[N];
ULL h[N], p[N];
ULL get(int l, int r)
{
return h[r] - h[l - 1] * p[r - l + 1];
}
int main()
{
scanf("%d%d", &n, &m);
scanf("%s", str + 1);
p[0] = 1;
for(int i = 1; i <= n; i++)
{
h[i] = h[i - 1] * P + str[i];
p[i] = p[i - 1] * P;
}
while(m--)
{
int l1, r1, l2, r2;
scanf("%d%d%d%d", &l1, &r1, &l2, &r2);
if(get(l1, r1) == get(l2, r2)) printf("Yes\n");
else printf("No\n");
}
return 0;
}